Recent questions tagged 73

A cylindrical conductor of radius R is carrying a constant current. The plot of the magnitude of the magnetic field, B with the distance d, from the centre of the conductor, is correctly represented by the figure

asked Jul 10, 2019 by pady_1

1 answer

The heat of combustion of $CH_4$, $C$(graphite) and $H_{2(g)}$ are respectively $20\;kcal$, $40\; kcal$ and $-10\; kcal$. The heat of formation of $CH_4$ is :

asked Dec 19, 2018 by pady_1

0 answers

The following reaction is known to occur in the body. If $CO_2$ escapes from the system : $CO_2 + H_2O \leftrightharpoons H_2CO_3 \leftrightharpoons H^+ + HCO_3^-$

asked Dec 19, 2018 by pady_1

0 answers

During Serpeck's process silica is eliminated as :

asked Dec 19, 2018 by pady_1

0 answers

3 moles of ethanol reacts with one mole of phosphorus tribromide to form 3 moles of bromo-ethane and one mole of X. Which of the following is X ?

asked Dec 11, 2018 by pady_1

0 answers

Sodium and copper have work functions $2.3 eV$ and $4.5 eV$ respectively. Then the ratio of the wavelengths is nearest to :

asked Dec 11, 2018 by pady_1

0 answers

To get three images of a single object, one should have two plane mirrors at an angle of :

asked Dec 11, 2018 by pady_1

0 answers

Glucose on prolonged heating with $HI$ gives :

asked Dec 11, 2018 by pady_1

0 answers

On treatment of $100 \;mL$ of $ 0.1 \;M$ solution of $CoCl_3.6H_2O$ with excess $AgNO_3;\; 1.2 \times 10^{22}$ ions are precipitated. The complex is :

asked Dec 11, 2018 by pady_1

0 answers

A wire of length 2 units is cut into two parts which are bent respectively to form a square of side $=x$ units and a circle of radius $=r$ units. If the sum of the areas of the square and the circle so formed is minimum, then :

asked Dec 11, 2018 by pady_1

1 answer

Let the tangents drawn to the circle, $x^2+y^2 = 16$ from the point $P(0,h)$ meet the $x$-axis at point A and B. If the area of $\Delta APB$ is minimum, then $h$ is equal to :

asked Dec 11, 2018 by pady_1

1 answer

In the reaction, $CH_3COOH \xrightarrow{LiAlH_4} A \xrightarrow{PCl_5} B \xrightarrow{Alc. KOH} C$, the product C is :

asked Dec 11, 2018 by pady_1

0 answers

Let $[\varepsilon_0]$ denote the dimensional formula of the permittivity of vaccum. If M = mass, L = length, T = time and A = electric current, then :

asked Dec 11, 2018 by pady_1

0 answers

The compressibility factor for a real gas at high pressure is :

asked Dec 11, 2018 by pady_1

0 answers

Which one of the following order represents the correct sequence of the increasing basic nature of the given oxides ?

asked Dec 11, 2018 by pady_1

1 answer

Statement-1: The point $A(3, 1, 6)$ is the mirror image of the point $B (1, 3, 4)$ in the plane $x - y +z =5$. Statement-2 : The plane $x-y +z=5$ bisects the line segment joining $A(3, 1, 6)$ and $B(1, 3, 4)$

asked Dec 11, 2018 by pady_1

0 answers

If P and Q are the points of intersection of the circles $x^2+y^2+3x+7y+2p-5=0$ and $x^2+y^2+2x+2y-p^2 = 0$ then there is a circle passing through P, Q and (1, 1) for

asked Nov 29, 2018 by pady_1

0 answers

In an experiment, electrons are made to pass through a narrow slit of width â€˜dâ€™ comparable to their de Broglie wavelength. They are detected on a screen at a distance â€˜Dâ€™ from the slit (see figure). Which of the following graph can be expected to represent the number of electrons â€˜Nâ€™ detected as a function of the detector position â€˜yâ€™(y = 0 corresponds to the middle of the slit)?

asked Nov 29, 2018 by pady_1

0 answers

A round uniform body of radius R, mass M and moment of inertia I, rolls down (without slipping) an inclined plane making an angle $\theta$ with the horizontal.Then its acceleration is :

asked Nov 29, 2018 by pady_1

0 answers

Uncertainty in the position of an electron (mass $9.1 \times 10^{-31} kg$) moving with a velocity $300\; ms^{-1}$, accurate upon $0.001 \%$ will be : ($ h = 6.63 \times 10^{-34} Js$)

asked Nov 13, 2018 by pady_1

1 answer

The value of $\begin{align} \int_{-\pi}^{\pi} \frac{\cos^2 x}{1+a^x} dx, a >0 \end{align}$, is :

asked Nov 5, 2018 by pady_1

0 answers

In a potentiometer experiment the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of $ 2 \Omega$, the balancing length becomes 120 cm. The internal resistance of the cell is :

asked Nov 5, 2018 by pady_1

0 answers

A particle moves towards east from a point A to a point B at the rate of $4\; km/h$ and then towards north from B to C at the rate of $%\; km/h$. If $AB = 12\; km$ and $BC = 5\; km$, then its average speed for its journey from A to C and resultant average velocity direct from A to C are respectively

asked Nov 5, 2018 by pady_1

0 answers

The correct order of atomic radii in group 13 elements is

asked Aug 21, 2018 by pady_1

1 answer

Which of the following RNAs should be most abundant in animal cell ?

asked Aug 21, 2018 by pady_1

1 answer

Nomenclature is governed by certain universal rules. Which one of the following is contrary to the rules of nomenclature ?

asked Aug 21, 2018 by pady_1

1 answer

The enzyme that is not present in succus entericus is -

asked Aug 21, 2018 by pady_1

1 answer

Magnetic moment 2.83 BM is given by which of the following ions? (At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)

asked Aug 20, 2018 by pady_1

2 answers

Which of the following is electron-deficient ?

asked Aug 20, 2018 by pady_1

1 answer

Which of the statements is not true ?

asked Aug 20, 2018 by pady_1

1 answer

The correct order of increasing bond length of $C – H, C – O, C – C$ and $C = C$ is :

asked Aug 16, 2018 by pady_1

1 answer

Which one of the following ions has electronic configuration $[Ar]3d^6$ (At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)

asked Jul 26, 2018 by pady_1

1 answer

Which of the following oxides is not expected to react with sodium hydroxide ?

asked Jul 26, 2018 by pady_1

1 answer

Bond dissociation enthalpy of $H_2$ , $Cl_2$ and HCl are 434, 242 and 431 kJ $mol^{ –1}$ respectively. Enthalpy of formation of HCl is -

asked Jul 26, 2018 by pady_1

1 answer

In which of the following the hydration energy is higher than the lattice energy:

asked Jul 26, 2018 by pady_1

1 answer

The major organic product in the reaction,$CH_3-O-CH(CH_3)_2+HI \to$ Product is:

asked Jul 25, 2018 by pady_1

0 answers

Four successive members of the first row transition elements are listed below with their atomic numbers. which one of them is expected to have the highest third ionization enthalpy :-

asked Jul 24, 2018 by pady_1

2 answers

Ionic radii are :-

asked Jul 24, 2018 by pady_1

1 answer

The temperature dependence of rate constant $(k)$ of a chemical reaction is written in terms of Arrhenius equation, $k = A.e^{–E^/RT}$. Activation energy $(E^)$ of the reaction can be calculated by plotting

asked Jul 24, 2018 by pady_1

1 answer

An atom has electronic configuration An atom has electronic configuration $1s^ 2$ $2s^2$ $2p^6$ $3s^2$ $3p^6$ $3d^3$ $4s^2$ , you will place it in which group ?

asked Jul 23, 2018 by pady_1

1 answer

When a bio chemical reaction is carried out in laboratory out side the human body in the absence of enzyme, then the rate of reaction obtained is $10^{–6}$ times, than activation energy of reaction in the presence of enzyme is : -

asked Jul 20, 2018 by pady_1

1 answer

Which statement is wrong about pH and $H^+$

asked Jul 20, 2018 by pady_1

1 answer

In which of the following molecule. The internuclear distance will be maximum :

asked Jun 15, 2018 by pady_1

1 answer

Find the odd one out

asked Dec 31, 2015 by pady_1

0 answers

, The bar graph shows the scores Brett obtained in his end of year exams. How many more did Brett score in his best subject than in his worst subject?

asked Dec 31, 2015 by pady_1

1 answer

Find the area of a rectangle when: length = 15 cm, breadth = 17 cm.

asked Dec 31, 2015 by pady_1

0 answers

Ninety five divided by one- fifth plus thirty five. What is the answer?

asked Dec 31, 2015 by pady_1

3 answers

Ron has a cycle worth \$ 1800 and he wants to sell it at a profit of \$ 220. What should cycles selling price be?

asked Dec 31, 2015 by pady_1

0 answers

Ask Questions, Get Answers